a NCHS. Births: Final Data for 1997. Monthly Vital Statistics Report; Vol 47,
No.18, April 29, 1999. 1955-1975 rates based on race of child; 1980-1992 were
previously reported by race of child, now reported by race of mother. Crude
birth rates are per 1000 population. Fertility rates are per 1000 women aged
15-44.